Questions tagged [motor]

An electrical actuator that converts electrical energy into rotational motion or sustained linear motion (linear motor). There are many types of electric motors. If the specific type of motor is known, it is helpful to use or add a more specific tag, such as dc-motor, brushless-dc motor or induction-motor.

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1answer
95 views

Why this H-bridge with only N-channel FETs didn't work?

Based on this answer here in StackExchange and the Motorola article it cites, I've designed a dual h-bridge motor driver with push-pull transistors to switch the FETs faster, layed out a PCB in KiCad ...
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53 views

How could I power a 775 motor with batteries? [on hold]

I am using a 775 motor to drive a system of pulleys with some load. This is the motor that I bought: https://www.ebay.co.uk/itm/775-DC12V-4500RPM-Motor-D-Style-Axle-Mini-Generator-DIY-High-Torque-...
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29 views

Motor controller oscilations with flyback diodes

Have some motor controller oscillations with flyback diodes when they were added to the build. They emerge with higher rates of signal amount making by controller. So there is a need to reduce the ...
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2answers
37 views

Safe to turn variable speed AC motor on/off via wall switched outlet

I have a (high velocity air) dual AC brush motor pet hair dryer (details). (There is no heating element.) It's rated at 120 Volts 18.5 Amps. It has a rotary knob (listed on the parts page as a "...
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1answer
74 views

4 Phase 5 Pin high speed motor driving (turbomolecular pump driver)

I just recently purchased a broken Turbomolecular pump from eBay and repaired it, now that it works again I need to build a low-cost driver for it. It has 4 Phases and normally relies on hall ...
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Induction Motor With Batteries [on hold]

Recommend me an electric motor which should be run up-to 4 - 6 hours with batteries. I had mentioned the batteries details below which i got. I think mostly induction motor are used in electric cars ...
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2answers
178 views

(edit) Brushless Motor - Why does the stator burn up if the rotor doesn't rotate?

If I was to apply power to a 3 phase stator, which in turn creates a magnetic field that's projected onto the rotor (with magnets), and (in a friction-less world) would cause the rotor to rotate (...
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1answer
39 views

Motor “load” for 8051 does not change based on 8051 GPIO pin

I implemented a circuit very similar to the following (original source: 8051 - Can an NPN transistor be driven? ) to control power to a vibration motor from my micro. I made the following ...
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1answer
34 views

Filtering power to stepper motor drivers for EMI

I have been using Allegro A5977 stepper drivers for a while now (a few years) and I had not too bad of a result meeting the EMI compliance targets even for CLASS B. However I went by the seat of my ...
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29 views

Controlling motor card with NI 9472 DO module

simulate this circuit – Schematic created using CircuitLab My goal is to simply turn on/off a 24VAC Motor. It is being driven by a card that I was originally just supplying 24VDC with from an ...
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3answers
94 views

How can I determine if this computer fan is dead?

Desktop computer fan started making noise then stopped. We noticed it requires 12V and will run at 200mA. I wasn't sure about that at first. Does that mean it has an internal resistance of : 12V / ...
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2answers
33 views

Why is the rotor power factor of the induction motor lagging?

A 460-V 60-Hz four-pole Y-connected induction motor is rated at 25 hp. The equivalent circuit parameters are R1 = 0.15 Ω, R2 = 0.154 Ω, XM = 20 Ω, X1 = 0.852 Ω, and X2 = 1.066 Ω. The rotor power ...
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What are the advantages for certain types of transformers? [duplicate]

I work designing medium voltage motor starters. Being an mechanical engineer, I still don't understand the advantages, disadvantages, and when to use certain types of transformers. When is wye-wye ...
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1answer
50 views

Connecting two motors in series

I have a 240-volt mains supply and I want to run two identical BLDC motors rated at 120 volts each. Without the need for a transformer with just the help of IGBTs and inverter can I run the motors? ...
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1answer
40 views

Induction Motor: Reason why the current locus is on the positive imaginary axis

The shown locus is of an induction motor. I was wondering if there is a reason why the imaginary current of a current locus of an induction machine is positive. Every equation contains a term like \$-...
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1answer
61 views

Running or belt conveyor with electric motors and control panel need a kind of certification to be sold in US market?

We want to provide new machinery of a runner conveyor and a belt conveyor in the US market. The equipment consists of: the basic construction (metal parts, runners, drums, and belts), electric ...
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1answer
33 views

Battery consumption for four N20 motors [closed]

Hi everyone Electrical newbie here. I wanted to use N20 motors with metal gear box for a 4WD smart car project. There are different RPM version of N20 like 200 rpm, 300 rpm and 500 rpm. If I choose ...
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2answers
62 views

Small motor (P<10W) with high torque

I need to find a small motor (max 10W) with a high torque(max 1Nm) and low rpm(max 60rpm). This question has been asked several time but I still have some doubts. I understand that the best option ...
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2answers
43 views

Half Bridge Low Side Mosfet vs. Flyback Diode

I intend to use this high side switch in a PWM application with a brushed 12V motor drawing 8A steady state max: https://www.nxp.com/docs/en/data-sheet/MC33981.pdf The switch allows for a half bridge ...
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1answer
72 views

How does DC braking stop an AC motor without considering current direction?

When a motor is coasting to standstill, if I apply a DC voltage across the windings I will brake that motor... We'll at least that's what I've read. Now here's the thing. With reverse current ...
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2answers
717 views

Why is the air gap between the stator and rotor on a motor kept as small as it is?

Between the stator windings and rotor is a small air gap. What would happen if this gap were larger than it is? Surely the magnetic field set up by energizing the stator windings would still cut the ...
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2answers
79 views

What is used as a rotary join in Lidar system? [closed]

I want to transfer data between a rotary platform mounting an antenna and a PC, so I can scan for a signal at 360 degrees. I could use a slip ring but there is a loss in signal. I want to transmit ...
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How do i control the speed of exhaust fan as the same way of controlling household fan? [duplicate]

I want to control the speed of this exhaust fan the same way household fan speed regulator works (The speed is discrete, using 0,1,2,3 button. the higher the button the faster fan spin) how do i do ...
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2answers
62 views

Why don't motors coupled to gearboxes spike up significantly?

A 5,5KW motor is rated 11,40A for the delta connection at 400V. This motor is coupled to a gearbox that reduces it's speed from 1440rpm to around 121rpm. On the gearbox shaft is a sprocket and chain ...
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4answers
83 views

How do I successfully connect a 3 phase motor using single phase 220 v?

I have a plastic crusher with a three phase motor and I will like to operate it using single phase 220v. Can anyone please help me out with instructions on how to connect it? Also, I want to know ...
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73 views

Maxwell Equations for modeling a DC Motor

I have seen so many videos about this and none helped me. I can't calculate B. (equation:\$ E = 2*N*area*B*cos(\theta))\$. I mean... when I calculate the field B, I find high values for the current. ...
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2answers
96 views

Is it possible to help accelerate a starting motor externally?

I have a rather small motor and a matching energy source. When the motor starts, it needs a (short) amount of time to 'rev up', to accelerate at its max speed. Is there any cause for this other than ...
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Burnt motor soft-start component - how to find a replacement?

Friends of mine handed me their grass trimmer to take a look if it can be repaired. It's powered by 230VAC and contains the following element in series with the motor, which seems to be the culprit: (...
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3answers
66 views

Why are core losses mechanical and not electrical in an AC power flow diagram? [closed]

The power flow diagram of a generator (a) and a motor (b) are shown. But why are core losses mechanical losses?
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3answers
97 views

How to bias BJT base voltage in a push pull amplifier AND control current gain

I am building a motor driver and using the push-pull arrangement shown. I need the output signal to be +/- 30V so each 'side' should be +/-15 and are balanced. Cutting to the chase I can't get my ...
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107 views

Why are all my motors and transformers failing at this specific location?

At my job there is a vacuum oven. There is a 50 hp, enclosed cooling fan. that circulates N2 gas upon quench, the design of the unit runs 480 volts through a reduction transformer to 230 volts. This ...
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1answer
47 views

What is internal generated voltage of synchronous motor?

A 208-V Y-connected synchronous motor is drawing 40 A at unity power factor from a 208-V power system. The field current flowing under these conditions is 2.7 A. Its synchronous reactance is 0.8 Ω. ...
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71 views

Hobby BLDC motor KV underrated voltage

tl;dr: I'm running a motor with 168KV with nominally 48V and 8064rpm at 20V and instead of 3360 I only get 1400rpm without a load, why!? How does the KV rating of a brushless DC motor come together? ...
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4answers
83 views

Can PNP BJT have its collector grounded?

I am designing a piezoelectric motor driver To save me inverting the H-bridge driving signal to provide a differential signal (as would be needed in the H-bridge shown) can I flip one side of the ...
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1answer
37 views

Controlling the reactive current of an PMSM in an open loop setting

for my master thesis I'm investigating the EMI of a 3-phase inverter, wich drives a PMSM. The inverter's structure is the common 3-Phase DC/AC Voltage Source Inverter and it uses EPC2020 GaN ...
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3answers
57 views

3hp motor contactor size 22A or 40A?

So my place has 2 contactor sizes of 22A and 40A. Now i know that both will be more than enough to power up a 3HP motor. To avoid oversizing in this case, would i need to provide additional fusing to ...
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2answers
77 views

Can I Move a wheelchair with two outrunner motors? [closed]

I am trying to turn a wheelchair electric and want to use a VESC to do so. However, I was wondering if an outrunner brushless motor with a belt to a larger gear would be effective and could move the ...
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1answer
66 views

Small project with a motor [closed]

So this project is very main function is controlling the motor spin direction and the speed witch is 0 to 5v, the all project works at 5v and i need a efficient way to controll the speed of the motor ...
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0answers
39 views

Old motor with unknown pulse generator signal

I have been building a new controller unit for a ~20 years old gate opener because it was never reliable, and eventually stopped working entirely. So far, I have got everything working except from ...
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2answers
41 views

How to wire additional relay for heavier load

I'm not an electronics student but have a decent grasp on the fundamentals. I am attempting to use an assortment of components to facilitate a driveway gate automation. The parts I have currently are: ...
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73 views

How can I add a relay to Fritzing?

I want to add a relay like this to Fritzing but all I can find is relays that can switch from circuit to circuit. I want one that can turn the motor on and off, can you tell me its name? I'm a French ...
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1answer
24 views

Providing additional fusing for multiple motors one branch circuit

so i have a 30A disconnect available for use at a customer site for running 2 5HP motors ( at 480V) the only question i have though is if the line is sized for a 10HP motor would both the 5HP motors ...
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1answer
38 views

Star-Delta starter connection of motors

The Star Delta Starter is a very common type of starter and is used extensively. It is said that a star delta is used for a cage motor designed to run normally on the delta connected stator winding. ...
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2answers
25 views

TB6612FNG DC Motor Driver Low Current Problem

I have a TB6612FNG pololu DC motor Driver (datasheet), and pololu 488:1 6V DC motor (motorPage). It is clearly stated that motor has 2.9A stall current at 6V and driver has 1.2 continuous current and ...
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47 views

DC Motor control PWM [duplicate]

I need to vary the speed of a DC geared motor using software (Raspberry Pi SW GPIO). The motor is 3 V DC geared micro motor @150 rpm. At 3 V full 'speed' the motor is very powerful for ...
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3answers
688 views

What does the output current rating from an H-Bridge's datasheet really mean?

I bought the H-Bridge VNH7070BAS from ST because it would drive up to 15A, but when I test it, it only reaches 6A and then it shuts down. What does that value really mean? How can I get the output ...
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1answer
69 views

Manually triggered variable speed rotating system

Intro: (okay to skip) The inspiration for this idea comes from a fidget spinner kind of kinetic desk toy - MezmoGlobe I bought this recently and fiddle with it regularly, but there is a catch 22 ...
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56 views

ATMega328P control servo motor speed with potentiometer

I'm trying to develop an application in atmel studio 7.0 which will allow me to control the speed of my servo motor with my potentiometer. Now, the problem is that I don't really know how to do that? ...
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2answers
109 views

How to accurately measure electric motor torque?

I'm currently doing an experiment on an AC motor to measure the torque output from a servo drive using fishing line wrapped around the servo shaft / gear while the other end is connected to a luggage ...
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1answer
32 views

Controlling DC Motor with stepper driver

I only have a stepper motor driver TB6600 available at the moment, can I use it for control of a a brushed dc motor? I think it should work as I could use PWM. I also want to be able to reverse ...